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Height accuracy is one of the important elements in surveying work especially for control point’s establishment which requires anaccurate measurement. There are many methods can be used to acquire height value such as tacheometry, leveling and GlobalPositioning System (GPS). This study has investigated the effect on height accuracy based on different observations which are singlebased and network based GPS methods. The GPS network is acquired from the local network namely Iskandar network. Thisnetwork has been setup to provide real-time correction data to rover GPS station while the single network is based on the knownGPS station. Nine ground control points were established evenly at the study area. Each ground control points were observed abouttwo and ten minutes. It was found that, the height accuracy give the different result for each observation

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

HEIGHT ACCURACY BASED ON DIFFERENT RTK GPS METHOD FOR ULTRALIGHT AIRCRAFT IMAGES